The following is a list of applications and their status on Plasma Phone.
Apps that can be tried to run are Plasma/Qt/QML apps, Ubuntu Touch (.click) apps, Gnome apps (e.g.GnomeChess), X11/SDL2 (e.g.xmame, frozen-bubble) and possibly other Qt-based apps like Sailfish OS or Nemo.
Packages can be installed by “apt-get install packagename”.